From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tiwei Bie Subject: [PATCH net-next v3 05/13] virtio_ring: introduce debug helpers Date: Wed, 21 Nov 2018 18:03:22 +0800 Message-ID: <20181121100330.24846-6-tiwei.bie@intel.com> References: <20181121100330.24846-1-tiwei.bie@intel.com> Cc: wexu@redhat.com, jfreimann@redhat.com, maxime.coquelin@redhat.com, tiwei.bie@intel.com To: mst@redhat.com, jasowang@redhat.com, virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, virtio-dev@lists.oasis-open.org Return-path: Received: from mga18.intel.com ([134.134.136.126]:14789 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729526AbeKUUjY (ORCPT ); Wed, 21 Nov 2018 15:39:24 -0500 In-Reply-To: <20181121100330.24846-1-tiwei.bie@intel.com> Sender: netdev-owner@vger.kernel.org List-ID: Introduce debug helpers for last_add_time update, check and invalid. They will be used by packed ring too. Signed-off-by: Tiwei Bie --- drivers/virtio/virtio_ring.c | 49 ++++++++++++++++++++++++-------------------- 1 file changed, 27 insertions(+), 22 deletions(-) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 0b97e5c79654..10d407910aa2 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -44,6 +44,26 @@ } while (0) #define END_USE(_vq) \ do { BUG_ON(!(_vq)->in_use); (_vq)->in_use = 0; } while(0) +#define LAST_ADD_TIME_UPDATE(_vq) \ + do { \ + ktime_t now = ktime_get(); \ + \ + /* No kick or get, with .1 second between? Warn. */ \ + if ((_vq)->last_add_time_valid) \ + WARN_ON(ktime_to_ms(ktime_sub(now, \ + (_vq)->last_add_time)) > 100); \ + (_vq)->last_add_time = now; \ + (_vq)->last_add_time_valid = true; \ + } while (0) +#define LAST_ADD_TIME_CHECK(_vq) \ + do { \ + if ((_vq)->last_add_time_valid) { \ + WARN_ON(ktime_to_ms(ktime_sub(ktime_get(), \ + (_vq)->last_add_time)) > 100); \ + } \ + } while (0) +#define LAST_ADD_TIME_INVALID(_vq) \ + ((_vq)->last_add_time_valid = false) #else #define BAD_RING(_vq, fmt, args...) \ do { \ @@ -53,6 +73,9 @@ } while (0) #define START_USE(vq) #define END_USE(vq) +#define LAST_ADD_TIME_UPDATE(vq) +#define LAST_ADD_TIME_CHECK(vq) +#define LAST_ADD_TIME_INVALID(vq) #endif struct vring_desc_state { @@ -295,18 +318,7 @@ static inline int virtqueue_add_split(struct virtqueue *_vq, return -EIO; } -#ifdef DEBUG - { - ktime_t now = ktime_get(); - - /* No kick or get, with .1 second between? Warn. */ - if (vq->last_add_time_valid) - WARN_ON(ktime_to_ms(ktime_sub(now, vq->last_add_time)) - > 100); - vq->last_add_time = now; - vq->last_add_time_valid = true; - } -#endif + LAST_ADD_TIME_UPDATE(vq); BUG_ON(total_sg == 0); @@ -467,13 +479,8 @@ static bool virtqueue_kick_prepare_split(struct virtqueue *_vq) new = vq->split.avail_idx_shadow; vq->num_added = 0; -#ifdef DEBUG - if (vq->last_add_time_valid) { - WARN_ON(ktime_to_ms(ktime_sub(ktime_get(), - vq->last_add_time)) > 100); - } - vq->last_add_time_valid = false; -#endif + LAST_ADD_TIME_CHECK(vq); + LAST_ADD_TIME_INVALID(vq); if (vq->event) { needs_kick = vring_need_event(virtio16_to_cpu(_vq->vdev, @@ -597,9 +604,7 @@ static void *virtqueue_get_buf_ctx_split(struct virtqueue *_vq, &vring_used_event(&vq->split.vring), cpu_to_virtio16(_vq->vdev, vq->last_used_idx)); -#ifdef DEBUG - vq->last_add_time_valid = false; -#endif + LAST_ADD_TIME_INVALID(vq); END_USE(vq); return ret; -- 2.14.5